Cavity Quantum Electrodynamics Ring Coupled Cluster and the Random Phase Approximation
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866908948658913280 |
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| author | DePrince III, A. Eugene Yuwono, Stephen H. Eshuis, Henk |
| author_facet | DePrince III, A. Eugene Yuwono, Stephen H. Eshuis, Henk |
| contents | It is well known that the ground-state correlation energy from the particle-hole channel of the random phase approximation (RPA) is formally equivalent to that from a simplified coupled cluster doubles (CCD) model that includes only ring diagram contraction contributions in the residual equations [{\em J. Chem. Phys.} {\bf 129}, 231101 (2008)]. We generalize this analytic result to the cavity quantum electrodynamics (QED) case and demonstrate the numerical equivalence of QED-RPA and a QED ring-CCD model that accounts for double electron excitations, coupled single electron excitations / single photon creation, and double photon creation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_09968 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Cavity Quantum Electrodynamics Ring Coupled Cluster and the Random Phase Approximation DePrince III, A. Eugene Yuwono, Stephen H. Eshuis, Henk Chemical Physics It is well known that the ground-state correlation energy from the particle-hole channel of the random phase approximation (RPA) is formally equivalent to that from a simplified coupled cluster doubles (CCD) model that includes only ring diagram contraction contributions in the residual equations [{\em J. Chem. Phys.} {\bf 129}, 231101 (2008)]. We generalize this analytic result to the cavity quantum electrodynamics (QED) case and demonstrate the numerical equivalence of QED-RPA and a QED ring-CCD model that accounts for double electron excitations, coupled single electron excitations / single photon creation, and double photon creation. |
| title | Cavity Quantum Electrodynamics Ring Coupled Cluster and the Random Phase Approximation |
| topic | Chemical Physics |
| url | https://arxiv.org/abs/2602.09968 |